Leave it to DARPA to come up with the next phase in moving us closer to our own destruction. They have set aside a portion of their budget to come up with robotic dogs of unusual size. Naturally, they will be meant to companions for soldiers, able to sniff out landmines and other explosives, keeping the soldier safe. And that's great. But let's see how angry it gets the first time someone does a fakeout with an invisible ball! Anyway, read more here and port these to your modern or future tabletop roleplaying setting right away.